Stylus pen



FIG. 1 is a front, top and right perspective view of a stylus pen showing my new design;

FIG. 2 is a rear, bottom and left perspective view thereof;

FIG. 3 is a front view thereof, a rear view being a mirror image thereof;

FIG. 4 is a right side view thereof, a left side view being a mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a stylus pen, as shown and described. 